Berechnung der Lärmemission von turbulenten Flammen mittels kompressibler Grobstruktursimulation und Direkter Numerischer Simulation

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The overriding objective of the joint proposal is to analyze the generation mechanism as well as the quantitative prediction of noise radiations from turbulent combustion with help of numerical tools. In co-operation with the partners of the first project phase (TP1 (Paschereit), TP2 (Janicka), TP3 (Schröder)) the generic burner configuration will be piloted such that the burner can be operated in the lean premixed re-gime. One major task of this subproject is to a gain deeper understanding of the noise generation mecha-nisms from turbulent premixed flames by using the direct numerical simulation (DNS) method, including chemiluminescent species. With help of the DNS it is possible to assess correlations between the noise gen-eration sources, e.g., the interaction of unsteady heat release and turbulent fluctuations. The OpenFOAM based DNS solver developed in the first funding period will be further developed and a flame data-base with highly resolved DNS data as reference for validating/improving large eddy simulations (LES) will be created. By use of the DNS data base, another objective remains to investigate and quantify the inherent correlation of excited chemiluminescent species (e.g. OH* or CH*) with the heat release rate. Highly-resolved compress-ible LES simulations will be used at the end in order to provide input values for the CAA solution in TP3 (Schröder) and to implement the achieved results from analysis of DNS data into the LES modeling methods (compressible and low-Ma) together with TP2 (Janicka).